From 03913b12cb9ae48d81ec773a1c6b93ba5fd2ad5d Mon Sep 17 00:00:00 2001
From: "Igor S. Gerasimov" <i.s.ger@ya.ru>
Date: Tue, 27 Jul 2021 20:40:51 +0300
Subject: FindLAPACK: IBM ESSL 6.1 also has LAPACK routines

---
 Modules/FindLAPACK.cmake | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/Modules/FindLAPACK.cmake b/Modules/FindLAPACK.cmake
index aa5423a..d70453b 100644
--- a/Modules/FindLAPACK.cmake
+++ b/Modules/FindLAPACK.cmake
@@ -586,6 +586,30 @@ if(NOT LAPACK_NOT_FOUND_MESSAGE)
     unset(_ssl2_suffix)
   endif()
 
+  # LAPACK in IBM ESSL library?
+  if(NOT LAPACK_LIBRARIES
+      AND (BLA_VENDOR MATCHES "IBMESSL" OR BLA_VENDOR STREQUAL "All"))
+    set(_lapack_essl_lib "essl")
+
+    # Check for OpenMP support, VIA BLA_VENDOR of esslsmp
+    if(BLA_VENDOR MATCHES "_SMP")
+      set(_lapack_essl_lib "${_lapack_essl_lib}smp")
+    endif()
+
+    check_lapack_libraries(
+      LAPACK_LIBRARIES
+      LAPACK
+      cheev
+      ""
+      "${_lapack_essl_lib}"
+      ""
+      ""
+      ""
+      "${BLAS_LIBRARIES}"
+    )
+    unset(_lapack_essl_lib)
+  endif()
+
   # NVHPC Library?
   if(NOT LAPACK_LIBRARIES
       AND (BLA_VENDOR MATCHES "NVHPC" OR BLA_VENDOR STREQUAL "All"))
-- 
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